I agree with Roffotron's choice of the i5-750, assuming you want to go with Intel and don't have $1000 to spend. This is the build I just put together to replace my nearly 5 year-old machine: (CPU) Intel i5-750 ... $200 (CASE) Antec Sonata III ATX ... $110 (MOBO) Gigabyte P55A-UD3 ... $135 (RAM) Corsair 2x2GB DDR3 1333 ...…
Well I'm assuming you'll be keeping an OS on at least one of your HDDs so here's what I suggest: GIGABYTE GA-H55M-S2H ($99.98, or $125 without rebate) Intel i5 750 ($200) ASUS EAH5770 CuC/2DI/1GD5 (or a 1GB 5700 to you and me, ($160) OCZ 4GB RAM ($85) GIGABYTE gz-ph1a3 ($20) OCZ ModXStream Pro 500W ($70) Total cost: $630…